I found this to work on my Toshiba TV/VHS combo MV19M4 after trying others suggestions that had worked on similar models but nothing worked on mine. Maybe it will work for yours. Follow these steps:

1: Unplug the TV for 1 minute then plug it back in.
2: In the menu select "TV Set Up".
3: Move the blinking block to beside "V-CHIP Set" BUT DO NOT SELECT IT.
4: Hold in the number 1 button on the remote.
5: Hold in the volume down button on the TV.

Your TV will turn off. Give it a few seconds to reset itself and then turn it back on and you will have to completely reprogram your settings. When you go to the V-CHIP settings it will ask for your new code.

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Most analog tv,u just reqiure pushing the tv manual button channel up a few times,tv will go into video modes like 1 or 2 for play video devices.If this doen't work,try website like Remotes.com to buy an original remote.

for sure the main board its broken and 80% chances that the picture tube has some internal damage that may can cause a rainbow effect, discoloration or color shadows. if you want it to try you can find the broke line traces on the main board , you can buy some tools at any radio shack store , and follow intructions . but its your bet to try the risk to have that picture disoloration and or learn some electronics